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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f43c271cba11ad0f3e5b1e0cf5a1d08d6c1f513aca686a1ef7da151a8c538072' 
  AND token = 'Qq4IXVVhC3S/Nuhsly3bzZ/ItQSDOOEyCfctkgZhvBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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