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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30de66a9a78be1df1d0f6d0a9bbfa610d8c42a709b58a49777c7dc3109885bb9' 
  AND token = 'CUgtk06XnvJHUJBLe90posjVPKYAINDaaT76YlS2REE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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