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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00ad5e58b499e4d4e0500910f5fda227340dc362605083b7b5cf4c308d0ee109' 
  AND token = '2eEVrN75R11IsMarGKfQKHpVdRe9d1okWPPfjj8MRvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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