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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6bf4bd08bd66087db6511ef5149b483f156afe5b878ff1c7af16563d8e5b6ec' 
  AND token = '5B7t54kegzvFRoXOLk4iEP8tO/6ZQF149NUNtuGZpRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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