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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1677777778aa19221f3b248f4fe8ea207beed4cb30b56fa13f78243e57ab2393' 
  AND token = 'yTvh1WT3yEr98ZC/s8x6g38mRUleWb3n2LhjT/qbOJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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