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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd50d2b355d09c1a8bc770d4a9b3daaf0c4d8ea5508e15cd3b6d47d1b4c854ef8' 
  AND token = 'mIby4pTWRvKo79Utfn5vs5LfTDFv52CF+Fag2Nae368=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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