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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8801dadd12be583757cb0d4d9a6940be0b5e6a94b7da1dba25e9b10d14b754a9' 
  AND token = '34QWUw+o5MdPJORh4sVH1m8HzFUm6SGh7e7lqG40ca8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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