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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c63d27327f7351abc73c8c8262568b0c9530c0e2c169ba51d983bc98e7caa878' 
  AND token = 'T+XxR9/Q2wriOlyuoCTm1gP7TwfzQFEodXZOKrIpRWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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