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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd6d69d521f237488448e8b325d11dbfbd11d5495811347036aba395fbed6af2' 
  AND token = 'sVlHm92tE25aoqQwTW2AWTm8HnrJe7tM5gGq+qPo4UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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