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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4f5b7ca1428cc2c2d20dfb98b7d81be6fda0bcbaaf9426ba6da314ff134b494' 
  AND token = 'yLF+VeBztvm3m6Wm3a04iiYMZQm10uNGmsRxAHecXX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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