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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '368eb16320b6802380e01cd38ac766b4ddc1dc7ead6d6c18852e9a8fb85d0c60' 
  AND token = 'WYt4xhTxspiurc4ojLQEzo84uF1QcKVGAvgXHUezunI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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