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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9506c92f02255574a3e57ed3df5dc5df31fd31f28b338e897e18ccc8216fcfb6' 
  AND token = 'VEuouwwXHewMiRk2qgHT24d4mBhlepEnDrztIlYU7d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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