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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51ae735f36063bb78bc7b6d15f4fb4a263e3a58fd22252c8523c7b2536d48e42' 
  AND token = 'u9lnqSe+s1AoxEUpmJOB6n2m9YDHCyCQZbuZ8va7t3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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