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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95f3a9b4607ade28b17d3009cd52fada43baa21d04aade61dca92560b62dd671' 
  AND token = 'wEpr6EMYGkFfearrpFKwlFtZYP9OdYpqIXIMTkDhaWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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