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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b30436e5fe6081a99b0dff2215df01df5dd731a06a42376e52af65a7ec488cb5' 
  AND token = '1X04cZEUZGLeAMfDwpieDHk0ikGLLk1/mHAa9k0OgXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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