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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5215ab33b11f9c8884576880f887de8f1fe7afc86e0bc20ea2eb2ebcb579dac6' 
  AND token = 'z0gLiJNyi0Yq7KNjJgE065cwaRUts58Xy/StH6vlySY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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