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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5de2fc97ba8304eea472272673c076b05baa4edcea2acb6bac9369aca42f731' 
  AND token = 'd7KaiiLuNbLXZB9lPdHjVkUGmUpVBM2G6fVh8Rtk7jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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