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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37b428892be4e89c86c763355fe006fdb967c3f2b049a088bcfa02d5010d4571' 
  AND token = '33a07L7kh3ZiO0cHMPwU3jwXPZJyzfbaiKTZw0Bk9p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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