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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93f8122dd4c1c210b5eb145afad81073607198d5a87ec0befcd667f504f8999d' 
  AND token = 'gI5PwPnYHsWl0vkrmzysG6kM6aVsDepw1MSITCohb4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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