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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acc663d2fdf87d33df2aa65c733dd269bd61047e1d06db7fffafa73bf7f9c56a' 
  AND token = 'uTMVAb1IufYoqXuQhqJ0H5MbVkGlRTI7mpJnABTvfB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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