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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a01fe60281f9c3849a3e925e4af288cd8d2cdc985639e3521bd891360aeae96' 
  AND token = 'uVBD/y6YpW8Rc61Jp/jUmiw6JE+7WTE2F9V8Mgo5pUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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