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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dca8548638ada43f00b8dd3de5b52ca7ef2f6c99838f593d9afd58112839312' 
  AND token = 'QgjKvYHwbrhEaMagSKLyGhhd0tEn3960klqXZojFggo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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