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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '981d0f71759b259f0ff39f1cba4a503745c8cd17bc1b2731fb99ed84e6c0b8fb' 
  AND token = '1BW9ELbZOkC3zFzWCJAXKK8Lxuw6W+iTKoH3X08ckI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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