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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40db1976359bb7c872aa51efe4f63f6ba2136d9688a148300a0ea1b882b8145c' 
  AND token = 'M8qe2Tdg3K5dPsfpFpraIHNFkOA5QVBWO1IibMo8/k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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