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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad765af003e0871a738c0102868a929b731295510067bb6bf9b7e9d8b2218fd9' 
  AND token = 'N31/97A7IfrKBTDS8K2FouonRikZI0vGOw1qX0Nc9Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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