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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '991ab1bd2268a8197b490cc3bb80d8072c7a7b1c7413b529a87c6bf559f51960' 
  AND token = 'ReD5rkRriEdmzTBP9SevSvLPPsfXDG5/22+/CwS4gGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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