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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4050af27c9093b6789118d62a611f4d7483a91df55276ca7e4c030e3d785517b' 
  AND token = 'y1jRqEcIFOXaSH0luxzAFDZF9qhfx4a4ikNb9JDrpJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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