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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22a9b3beb36d0493c1750f1bf894b32923246e217393f4d2c974e48334627014' 
  AND token = 'kMDA8+bzC4O0nnUIN41oOc7Bu6cVSR9SqwfthWyH488=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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