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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb2bc0e8fa37beccec83e4f1e979ea366e249d2658d9089849a36a8ec49ed300' 
  AND token = 'oJuBtJW55Q1LUkpHJsXmNPMVWpBtJ/b5VmpNSQs2Ii4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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