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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7a6ea750c68a1af12669bc87eb297aa97fae00b2b6e8428148c89a9e1ae22f1' 
  AND token = 'Le+Ffrn5s4AwJsbxr2HPi2HWH4gfQx5osvdOLZsoa/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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