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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1438244614f06e695b8ec325ebfc54d20826b245623abb1db0014003ee5f37f8' 
  AND token = 'Zk9GvQIlj9ADS3mp6fIwtprYZs4lk2NdAMr3FQM23/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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