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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4240de5a1b049d9c100595e04d5407bda645671f470d807a7c344b8b7fefeb0c' 
  AND token = 'vaQq1yU82EhDDsxNJ5U8SA4NwoY8ZQz+k+CCCehsT/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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