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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1024cfd91b6b7c2659889588c473828d08aad8b02ae6181ee50809b1c5b624bc' 
  AND token = '9M4zO3P2D3hIIbXktAqseOAB0BR4gqjhZVsnaTR9w9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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