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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea810c4da7fca9e6ed4a212c59fa3d821e78edc1ea4d6e7606bf2b6ed0179c00' 
  AND token = 'ctGg2c+kyVE2yHJIVO+BZvlHmnDMxyelku9BC/Phvz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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