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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b71190d5870e9c40b37e0c95efd279439e4a24788c1cff38de7c76b1b976c9c' 
  AND token = 'RVhTj/Fj7shk18k83Db5eXykC/RRDfLPdiwNZe0Bi9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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