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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd25a4658287cc0849208cea4012f6eceef5ac5456120b31a4535b5370e1e81fc' 
  AND token = 'xbuwlvojhqLygNMEwIrX9tfeoCx2oipPqEmslD8isF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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