Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '233924f2fa5e0f71247443464bc0a0d9ceae7fae366f66c18c8c5b8bd85da640' 
  AND token = 'Nft6IZw8ihHPk6CB95flN7qE2x0QPebSqBafpNCzdyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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