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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd4d421da3a887a70714d4f119751018a9f078c86cb73412b9e20f78beca6826' 
  AND token = 'jc8ctGL6bEwYgrmY2qSvO7eht70e+G9ESeO05QDz4eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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