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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41b01ec796933649726793e2204f33be6c07d7072017d3dd44423fc54b8a4813' 
  AND token = 'IeD15MQPHcJIeHCdcLiCIxOa3rg6fatg7LBFWx4R00s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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