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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '319e0920aa39c6a7e9ad0814ea01237e9724d8fb10693f80b644e84e6ab35145' 
  AND token = 'oTh2Kv5y3yE19xanFVVOj4TERyTLOQz0VVRJrHpoEck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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