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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3be58fb1c2663da52ebfdb857083c657b7c8b8060bb7173d688fdc8ac50e2b53' 
  AND token = 'YhHmYBQ9M4UmMWaE7ClsIVO5Gs3VHEz49v60TEz2+9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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