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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0e9f825b4d0200f9ab1dd2111736f0456c420ada95c9504d615ba856d23f61a' 
  AND token = 'z8Gcp772COkGssTl8Oic7UGgpTcDV46Rxbu+H2TQY/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}