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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31da1970db051e6a987513df30bf227e4151d6bfef9f085ab83929b78ccb122c' 
  AND token = 'XEmoirZq94rtLasu8OovwDEANenZqK9H1hQdexSHbko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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