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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff817a81135d23efa121f33d29c67f53940dcd0477858e5a4a9c72ccfdcdcdf0' 
  AND token = 'NvhncIEVrr5Hv32B4khl9mLU7l6M3UWJZw70rcHj+8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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