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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af41c8a54f4c5e381944289295e48e15542308ad3b222e336252122749aa45c3' 
  AND token = 'JbNnrEqxm/mcBhilDhBQVYjvb2asYRoat32/LGZMZL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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