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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '459c2fac0c05308065a773ac386a0dbc45e741b782f8eb91f9184bd5c17fc52c' 
  AND token = 'cGxI5SyW3bL44B4cY7gJ1UZWXt+s7fWmqKUikYBKfTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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