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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '923d1f1f17bccd26d6ed38dd16f324981917dbaf2fdc87c6bc94597a5bf01b42' 
  AND token = '2OhcHZ4PsS8+/B11QRCZZI/BnFhh+i9Ug/ENkydDFWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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