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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a693ebfb5660dd5a25e8fa1f71c4a116db6884c9e5a999591ced5a6613d69fc' 
  AND token = 'SglSZ8+fTvFv/W3WsSp057HgZR9A9OFzMpb7pqtXtCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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