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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '040a0639400330aba49c2d79eef835e95d83808edd608ef9c3c3b1a3fe0f49b0' 
  AND token = 'VEZpGkDuewI0qFvjocB/gN+U3x4DU83rtnFILhMbIbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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