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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '817720959ab5d42e32bd4c5537ec851ab0be064a48a9fe9775d1c3e040e53bb1' 
  AND token = 'vQKim+5tnVynYXUqlylA++neRSMNa3enYFNyh+QRNLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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