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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebd881a6f3ce56c0a1e2d5a35ba5bbc632b1a457332272aabb0078c777b4d361' 
  AND token = 'vYrbZt+Be/pVinZsE3Bgux4rTgx6lUvdTmGlJx0Y8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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